Electric switch and backing device therefor



Aug. 2, 1932. F. H. MAcNElL ELECTRIC SWITCH AND RACKING DEVICE THEREFO-RM14-Wj l@ Aug. 2, 1932, F. H. MAcNEn.

ELECTRIC SWITCH AND RACKING DEVICE THEREFOR Filed Oct. 18, 1929 4Sheets-Sheet 2 I nu,l

Aug. 2, 1932. F. H. MACNEIL.

ELECTRIC SWITCH AND RACKING DEVICE THEREFOR Filed Oct. 18,. 1929 4Sheets-Sheet 5 MCC] Aug. 2, 1932. F. H. MAcNElL ELECTRIC SWITCH ANDRACKING DEVICE THEREFOR Filed Oct. 18, 1929 4 Sheets-Sheet 4 PatentedAug. 2, 1932 stares lArs FREDERICK H'. MACNEIL, OFYBOSTON,MASSACHUSETTS, .liSS'lGrllORV T0 CGNDIT ELEC- TRICAL MAN'UFACTURlNG-CORPORATION, 0F SOUTH BOSTON, MASSACHUSETTS, A.

CORPORATLON MASSAFHJSETTS ELECTRIC SWITCH AND BACKNG DEVE THEREFOR ing,switches which are arranged to be autoy maticaily connected anddisconnected by corresponding movements of the truck to and from itscircuit controlling position.

rhe truck is adapted to be rolled on its wheels bythe operator into aposition wherein the disconnecting switches are about to engage, andforce-multiplying means are provided to move the truck lforcibly theremaining distance into circuit Vcontrolling' position during whichImovement th-e disconnecting contacts are moved into frictionalengagement. ln moving the truck out of circuit controlling position, theforce multiplymg means is utilized to move the truck into aterminal-disengaged position from which the switch may be easilyWithdrawn by the operator.

It is an object of the present invention to provide an improved rackingdevice for forcibly Vetlecting t ie iinal and initial movement of thetruck to and from circuit controlling position and also to provide meansfor interlocking the racking means with vthe circuit interrupter so thatit is impossible for the operator to move the truck into or out ofterminal engagement unless the. interrupter is in contact open position,and also to preventthe operator from changing the condition of theinterrupter during the racking operation.

During the horizontal movement of the truck to and from circuitcontrolling position, the truck is adapted to be arrested in anintermediate position in which the movable contacts of secondarydisconnecting switches carried by the truck are engaged by asupplementary set of fixed vcontacts carried by the fixed portion of theswitch, gear.

Application filed ctober 18, 1929. Serial No. 400,536.

In this position of thev secondary contacts all of the low tension orsecondary circuits are connected electrically with conveniently locatedtest terminals; and it constitutes a further object of the invention toprovide automatic means to loci; `thel truck in this test position inits movement, both into and out of the cell.

A yet further object of the invention is the provision of acell-enclosed truck type switch having interconnecting members car- Yied by the'truck and cell arranged to eect a predetermined movement ofthe truck and means to lock the truck in intermediate positionV whilemaintaining said interconnecting members in cooperating engagement.

A yet further object of the Vinvention is the vprovision Vof automaticmeans to lock the truck in the aforesaid intermediate position, andmanual means operable from the front of thetruck to release said lockingmeans.

A yet further lobject of the invention is the provision of meansautomatically operated by the withdrawal of the truck from the cell formovingthe manually controlled locking means into locking position.

Another object of the invention is generallyto improve the constructionand operation of enclosed electric switch gear.

` Fig. l is av side elevation of a cell enclosed truck type electricswitch and the racking device therefor embodying the invention, the

enclosing cell being shown in section.

Fig. 2 is a sectional elevation showing the interconnecting memberscarried by the truck and cell by which the truck is racked into and Voutof circuit controlling position.

Fig. 3 is a plan view taken on line 3-3 of Fig. 2. v

Fig. 4 is a front sectional elevation taken along line 4 4 of Fig. l.

Fig. 5 is a detail showing the interlocking cam mechanism.

Fig. 6 is a front sectional elevation of Fig. 5. v

Fig. 7 is a partial front elevation showing the automatic locking meansfor the manual operating lever. Y

Fig. 8 is a sectional elevation of the interconnecting members of thetruck and cell with the truck in the out-position.

Fig. 9 is a plan view taken along line 9-9 of Fig. 8.

Fig. 10 is a perspective view of the breaker operating crank.

Fig. 11 is a perspective view of the cam le'ver.

Fig. 12 is a perspective View of the rack and pinion housing.

rlie enclosing cell structure for the switch includes the bottom wall10, the top wall 12, and the rear wall 14, which forms the front closurefor a bus compartment A in which are located the fixed line terminalsv(not shown) whichare adapted to cooperate with the movable terminalscarried by the breaker. Said rear wall 14 is provided with suitableapertures 16 in alignmentwith said fixed terminals.

YThe movable, or truck, portion of the switch gear includes the bottomsupporting platform 18 having truck wheels 20, the rear wall 22, topwall 24, side walls26, and the front lwall 28, which latter wallcomprises the closure for the open front of the fixed p0rtion of theswitch gear. The rear wall 22 is provided with openings 80 whichare linalignment with openings 16 in the rear wall 14 of the cell. Horizontalinsulating bushingsy 32 are secured in said openings 30 and projectthrough said apertures-16mm the bus compartment A when the truck is incircuit controlling position in the cell. Said bushings 32 areprovided'with conduct-ing studs 84 which terminate in contact members 36constituting the movable contact members of automatic disconnectingswitches, the fixed Contact members ofwhich are carried by the lineterminals of the cell structure.

The circuit interrupter herein shown `is of the three phase type-comprising three separate phase units, each of which includes a switchframe 88 and an oil receptacle 40 secured dependingly therebelow bymeans of tie-rods 42 and an elevated wheeled platform 44. Each phaseunit of said interrupter is adapted to be-supported independently andremovably in elevated position on the movable switch gear whereby theseveral units thereof may be separately lowered and rolled away on thewheelsV 46 of platform 44. rllhe switchy frames B8 of the interruptersare accordingly provided with forwardly extending ledges 50 which areadapted to rest upon a transverse supporting member including as anintegral unit a `channel member 58, an angle 53a, and a flat bar 53?).Said transerse member is supported by means of a pair of spacedhorizontal channel members 54 which are secured to the opposite sidewalls 26 of the movable truck.. The Yrear support for the interruptercomprises an yangle 56 which is secured removably to the switch frame 38by bolts 57 and rests on the upper legs of the spaced channels 54 towhich it is secured removably by bolts. A second and inverted anglemember` 58 extends between the legs of channels 54, and is securedpermanently to the angle 56, as by welding.

To remove the interrupter from the truck, the bolts securing angle 56 tothe channels 54 are removed and the interrupter is drawn rearwardlyalong the top of channels 54 until the ledge 56 of the switch frameisfree from channel 52 of the transverse supporting'member after which thebolts 57 Aare removed and the switch is lowered by suitable means (notshown).A Said switch rframe 38 is further provided with a forwardlyextended platen 60 which is secured thereto by means lof bolts 62 and isspaced frein the switch fra-me by means of cylindrical spacer members 64which surround the bolts 60. Said platen has secured thereto, at theto-p and bottom, transverse angles 66 and 67 which are secured to thefront wall 28. Said platen 60 is adapted to provide the support for theswitchy opening and closing mechanism 68. Each interrupter unit isfurther provided with a pairv of upstanding insulating bushings 70having terminals 72 which are connected by means ofV conductors l74 and7 6 with the line and bus terminals '7 8 and 80 respectively. l

The movable truck unit is adapted to be rolled horizontally into and outof the cell on rails 82 fixed to the cell rfloor 1() which are adaptedto be engaged by the flanges 84 on wheels 2O whereby to guide the truckunit and align the bushings 32thefreof -with the apertures 16 in therea-r wall 14. Y

ln describing the operation of the breaker,

itwill be convenient to designate four positions in the horizontalmovementthereof into and out of the cell structure, first, the full-outposition when the truck unitis entirely removed'from the cell structure;second, the disconnect position in which the truck is partly within thecell but with the movable contact members 86 of the automaticdisconnecting switches entirely disconnected from their cooperatingfixed terminal Y members; third, the test position, in which l thecontact members 36 are still out of engagement with their cooperatingfixed terminals and-the movable secondary Contact members 86 are'inengagement with the forward fixed secondary contact members 88;

fourth, the in position, as shown in Fig. 1', in which the contactmembers 86 of the disconnecting switches are in engagement with theircooperating contact members, and the movable secondary disconnects 86are in engagement with the service contacts 90.

There are a plurality of secondary contactY members 86, 88-and 96 which.are arranged i setstransversely of the cell and the truck and-,themoving set is arranged to have a sliding engagement with the stationarysets andV to yield vertically while making and breaking such engagement,The movable set 86 isconnected to the various opening, closing andcontrol apparatus carried by the truck, and when engaged with the set90, connect such apparatus with suitable control circuits by which theswitch is operated in service and its condition indicated. When themoving set of contacts 86 is connected with the test contacts 88,connection is made to circuits by which the operation of the switch canbe tested while it is free from the power circuit.

To put the switch in service, the movable or truck portion is adapted tobe rolled on its wheels by the operator into the disconnect position andthereafter racking means are provided for forcibly moving the truck intothe in position during` which movement the fri/:tional engagement of theautomatic disconnecting switches takes place.

The racking device consists essentially of interconnecting rack andpinion members carried by the liXed and movable switch gearrespectively, as shown most clearly in Figs. 1 and 2. The rear vwall'14of the cellis pro# vided with a transverse angle92 to the npstanding legof which is secured a bracket 94 having spaced vertical webs 96 betweenwhich is pivotally supported a substantially horizontal raclr98, asshown in Figs. 8 and 9. Said rack 98 is provided with gear teeth 100 onthe -top surface thereof which are adapted Vto engagea pinion gearcarried by the truck as will presently appear. In the normal positionvof the rack when the truck is in its full-out7 position, the forwardend of said rack is adapted to be lowered slightly below the horizontalposition, as is'shown in Fig. 8, wherein Athe lower end of an adjustingscrew 102 therein is adapted to be in engagement with 'the lowerhorizontal face 104 of bracket 94 which acts as a stopl to limit furtherdownward movement of the rack.

A pinion and rack housing is carried by the rear wall 22 of the truck inposition to receive the forwardly extending endof raclr 98 when thetruck is moved into the cell.. Said housing, as shown most clearly inFig. 12, includes the upper and lower supporting'flanges 106 and 108which are adapted to be secured by bolts to the upper and lowertransverse supporting angles 110 and 112 carried by the rear wall 22.Said housing is provided with an integral upper ournal block 114 inwhich end of the horizontal shaft 116 is jonrnalled, and a lowerbifurcated journal block 118 at one side of the ournal bloclr 114 anddirectly beneath the racl Q8 when vit is disposed adjacent the housing.Said lower journal bloclr 118 supports a rack-lifting lever 122 which isM, ournalled between the bifurcations 120 thereof on a shaft 124extended between said bifurcations. Said rack-lifting lever, as shown inFigs. 2 and 4, includes an upstanding arm 126 which is received betweenbifurcations 120 directly beneath rack 98, and a forwardly extendingAarm 128 which is provided with an offset boss 130 at its extended end.rlhe upsta-nding arm 126 is further provided with a roller 132 which isjournalled between bifurcations 134 thereof on a pin 186, which rollerlies directly beneath and is adapted to engage the bottom ofthe rack 98.Said shaft 124 is extended beyond 'the'v ournal block 118 and provides apivotal support for a lockplunger lever 138 which is adapted to berotated about said shaft indepen Vently of the rack lifting lever 122.That bifurcation 120 of said housing that is adjacent the lever 188 isprovided with a vertical guide passage 140 behind the journal for shaft124, and is further provided with a slot 142 which is in vertical'alignment with and is open into the passage 140.

A lock-plunger 144 which is verticallymovable in the passage 140 has ahorizontal slot 146 in one side thereof which receives a pin 148 carriedby an arm 150 of the lochpiunger lever 138, whereby upon rotation oflever 138, the plunger 144 will be raised and lowered for purposeshereinafter to be described. 'llhe slot 142 is somewhat wider than thediameter of pin 146 whereby to permit a certain amount of horizontal.movement of the pin in the slot as the arm 150 is rotated about itspivotal shaft 124.

A bloclr 152 is welded to the arm 188 directly beneath the boss 130 ontl e rech-lifting' lever 122 in Aposition to engage the boss and rotatethe rech-lifting ier 'in unison with the lock-plunger lever in theclockwise rotation of the latter.

` The horizontal operating shaft 116 which has its one end journalled inthe bearin blocl; 114 has its other and opposite end irnalled inabearing blocl; 156 '-.vhich is carried by an outstanding bracket 158secnred to the supporting framework of the truck. As shown most clearlyin 4, pinion gear 154 is fixed to said oper ft 116 adjacent the bea-ringblock 114 in position to overlie and engagek the teeth of rack 98 whenthe rack is elevated by lever into a horizontal position. Y

Said bracket 1581s further provided with an integral entstanding`projection 160, 4, which constitutes a journal for a horizontal shaft162 disposed below and normal to the shaft 116. Said shaft is iournalledat its forward end, at the front of the truclr and cell, in bracket 164and is provided at its rear end with a worm 166 which derives a wormwheel 168 carried by sl'iaf., 116.V rllh-e sha f t 162 is provided atits forward end with a pin 170 which is adapted to be engaged by acranlr (not shown)` by which the shaft 162 and accordingly the pinion154 is adapted to be rotated in either direction.v It will be evidentthat rotation of the crank in one direction :will cause the clockwiserotation of the pinion gear 154, Fig. 2, whereby to draw theY truck intothe cell when the gear and rack are in engagement and that the rotationof the gear in the opposite direction will cause the truck to be movedoutwardly of the cell.

Manually operable means are provided to cooperate with the verticallock-plunger 144 to lock the truck against movement caused by theracking pinion 154. Said means includes a long abutment block 172 whichis welded to the right side of the rack, as viewed in Fig. 4, and asecond but shorter abutment block 174 which is likewise secured to therack and is spaced from the block 172 to provide an opening 17 6therebetween into which the plunger 144 is adapted tol enter. rlhe endsof said blocks, as shown most clearly in Fig. 2, are slightly bevelledat the bottom thereof to facilitate the upward movement of pin 144 intoa position behind tne ends thereof. A third block 178 is secured to theleft side of said rack viewed inV 4, substantially opposite block 174which is adapted, in the lowered position of the rack shown in Fig. 8,to engage an abutment 180 on the pinion housing, Fig. 12, whereby tolimit the movement of the truck into the cell in the lowered position ofthe rack. With the rack and housing in the position shown in Figs. 8 and9, the switch is in its disconnect position. The lock-plunger 144 isadapted to be manually operated into and out of locking position bymeans of a finger lever 182, Fig. 1,*which is pivotally connected at 188to the lower depending end of a cam lever 184 carried bythe left sideasin Fig. 7, of switch frame 38 of the right hand switch unit. Said fingerlever 182 is adapted to be pulled forwardly from the position shown inFig. 1 into a position in which the vertical face 186 of a notch in itslower edge is adapted to engage the front panel 28 of the truck wherebyto hold the finger lever releasably in its forward position. Said lingerlever is connected operatively with the arm 188 of the lock plungerlever 138 by means of an offset link 190 whichis pivoted to the pin 188and is also pivoted to a shoulder screw 184e which is clamped rigidly tothe arm 188 in a slot 190e therein. The shoulder screw 184e is adaptedto be clamped in various positions in the slot 190@ to effect angularadjustment of the locksplunger lever.

Means are provided to interlock said finger lever 182 with the operatingmechanism of the interrupter whereby to prevent movement of said fingerlever into its forward position and the consequent unlocking of therack,

` except when the interrupter is in fully open position. To this end, a,cam lever 184, Fig. 11,'is pivoted to the left side of the switch frame88 of the right hand switch unit at 192 and is provided with an upperarcuate cam face 194, Fig. 5, which in the position of lever 184 in Fig.1,l is struck about a center coincident with that of the shaft 196 ofthe `switch y operating mechanism for the interrupter. l

Said shaft 196 extends outwardly through the switch frame of theinterrupter and has fixed thereto a bifurcated crank 198, Fig. 10, whichhas pivotally connected between the bifurcations thereof at its lowerend an operating shaft 200 which is connected at its forward end withthe switch closing solenoid of the operating mechanism 68. Said crank isprovided with an integral cam 202 which lies closely adjacent the switchframe 38; and said cam 'is provided with an arcuate lower end face 204which is struck about the axis of shaft 196. Said cam 202 is furtherprovided with a substantially vertical cam face 206 which` in theposition of the crank 198, in I1`ig.Y

5,l is struck about the pivot point 192 of the cam lever 184 and isadapted to cooperate in the position of the part-s shown in Fig. withthe arcuate cam face 206e of the cam lever 184, which is also struckabout the pivot point 192 thereof. ln the switch open position of the-interrupter shown in Fig. 5, the finger lever 182 is free to move intoand out of rack locking position, the cam'face 204 being disposed inaforward position where it is out `of interference with the cam face 194of the cam lever 184. In this position, however, in which the rack isunlocked, the cam face 206e of vsaid cam lever is disposed behind thecam face 206 of crank 198, thus to prevent closing movement of theswitch.

In. this position, the cam face 206 of the breaker crank issubstantially normal to the pivotal point 192 of the cam lever. 'Whenthe parts are moved to the position shown in F ig. 1 wherein the rackingdevice is locked, the crank arm 198 is free to move between switch openand switchclosed positions, butin the switch closed position thereofprevents the operation of finger lever 182 to release the lock on theracking device. Thus, it is evident that to close the breaker, theracking device must first be locked and that when the breaker is closed,it is impossible to release the loc-king device for the rack.

The operation of the truck racking device is as follows Y AVhen thetruck is rolled into the cell from its fully out7 position wherein it iscompletely out of the cell into the disconnect In the disconnectposition of the truck,

the pinion 154 is disposed above but out of engagement with the rackteeth 100 and the lock-plunger lever and rack raising lever are in thedotted position of Fig. 2, wherein the roll 132 of the rack-raisinglever is in its forward and lowered position. If now it is desired tocontinue the movement of the switch into the cell, the interrupter, ifclosed, must be opened to rotate the crank arm 198 in a clockwisedirection and permit the forward increment of the manually-operatediinger lever 182 thus to rotate the lock plunger lever in a clockwisedirection and cause the lock-plunger 144 to drop from in front of theblock 174 and unlock the truck. Movement of the lock plunger lever in aclockwise direction due to the engagement of block 152 thereof with theboss 130 of the rack lifting lever` causes the latter to be rotatedsimultaneously in a clockwise direction to raise the roller 132 thereofinto engagement with the bottom surface of the rack to raise the rackand effect engagement of the rack teeth with the pinion 154. In theupper position of roller 132, the pivot pin 136 thereof is slightly backof the vertical plane including the pivot point 124 and is adapt-ed torest against the inclined front face 208 of the left hand bifurcation120 of the rack housing, Fig. 12. rlhe rack lifting lever is held inthis over-center position by the weight of the rack, thus to hold therack, when once raised, in engagement with the pinion independently ofthe block 152 on the lock plunger lever. The clockwise rotation of therack lifting lever into the aforesaid position causes the disengagementof the abutment 178 and block 180 and conditions the racking device formovement of the truck into the cell.

As heretofore described, the unlocking movement of the racking devicealso effects the movement of the cam lever 184 into the position shownin Fig. wherein it temporarily locks the breaker against closing ifmovement. In this position of the truck, the

operating crank for the racking device `can be operated in a directionto rotate the pinion 154 in a clockwise direction, as viewed in Fig. 1,whereby to eect the cooperation of the pinion and rack to draw the truckslowly but forcibly into its circuit controlling position. IVhen theswitch is in the position shown in Fig. 1, the finger lever 182 can bereleased to lower the lock plunger lever 188 and raise the plunger 144into position behind the block 172 thus to lock the racking deviceagainst operation. However, it will be obvious that during thehorizontal movement of the pin 144 beneath the block 172 of the rack,

" it is impossible to so raise the locking plunger 144 and thus it isimpossible to move the cam lever 184 into a position wherein the switchcan be closed during the operation `of the racking device.

interrupter be in open positoin,thus to permit the finger lever to bepulled outwardly and unlock the racking device by the clockwise rotationof lever 188. The pinion gear 154 can then be rotated in acounter-clockwise direction by its operating crank during whichrotationV the truck will be moved outwardly from the cell structureuntil the pinion, gear 154 is directly over the blank 'end portion 210of the rack in which position the truck can be pulled out by hand intoits fully out position entirely free from the cell. During the drawingout motion of the truck, the weight of the rack holds the rack liftinglever 126 in its upper position as shown in Fig. 2 until the roller 132thereof reaches the inclined portion 212 at the extreme end of the rack,whereupon lever 122 drops to the position shown in dotted lines in Fig.2.

In describing the operation of the racking device, no reference has beenmade to the previously mentioned test position of the truck, wherein thecooperating fixed and movable secondary disconnects 88 and 86 are inengagement. Means are provided automatically to arrest the movement ofthe truck in the test position wherein the locking plunger 144 isdisposed beneath and is therefore free to enter into the space 176between the blocks 174 and 172. To this end, a cam block 214 is securedto a transverse angle 215 car-l ried by the top wall 12 of the cellstructure. Said cani block has cam projections 216, 218 disposed onebehind the other and adapted to be engaged successively by a rol/ler 220carried by an arm 222 pivoted intermediate its ends at 224 to the truck.Said arm 222 is pivoted at its forwardly extended end to a verticaltripping bar 226, Fig. 7 which'is formed in two sections which areadjustably bolted together at 228. Said tripping bar is guided forvertical movement by a plate 230 secured to the forwardly extended legof angle 53 of the truck and is provided at its lower end with an offsetportion having -a vertical slet 232 within which the finger lever 182'is slidably received. The weight of said tripping bar 226 and theforwardly extended end of lever 222 causes the lever to occupy theposition shown in Fig. 1 in which the roll 220 thereof is in itsuppermost position and the top edge of said lever is in engagementwith-the stop A 234 supported by the top wall 24 of the truck. In thiselevated position, the roller is adapted to be engaged and depressedsuccessively yby the cam projections 218,216 as the truck is racked outof the cell. The slot 232 in the tripping lever 226 is so arranged thatin the normal position'of the parts shownin Figs. 1 and 7 the bottomofthe slot 232 is in engagement with the lower edge of the finger lever182. When the roll 220 is in a position to lbe beneath and be depressedby the cam projection 218, the locking plunger 144 is directly beneaththe space 176 between the blocks 172 and 174 of the rack, and due to theupward movement of the tripping lever 226 caused by the cam, the fingerlever 182 is raised sufiiciently to unlatch the abutment 186 thereoffrom the panel 28 whereby to permit the lockplunger lever to rotatecountercloclrwise by gravity and raise the loclr plunger 144 intoposition in the space 17 6 wherein the ,truck is locked. In thisposition, the switch may either be returned to its"in position or, byholding the linger lever 182 in av forward position, the operating crankfor the pinion gear 154 may be turned suiliciently to allow the roller220 tol pass into the depression beyond the cam projection 218. In thisposition, the finger lever 182 will again stay latched. Subsequentmovement of the truck out of the cell will cause a second tripping ofthe finger lever 182 in a similar mannerA when roller 220 is depressedby the second and foremost cam projection 216. Thus it will be seen thatthe final movement of the switch from the cell automatically throws thelocking plunger upwardly into locking position leaving the-interrupterfree to open and close.

The invention may be otherwise modified without departing from the scopeof the invention.

I claim: Y

l. An electric switch gear including` a cell,

. a truck movable into and out of said cell, a

switch carried by said truck having switchl operating mechanism,cooperating contact members carried by said cell and truck,forcemultiplying means connecting said truck and cell for moving saidtruck into and out of said cell, means to lock said force-multiplyingmeans against operation, and manual means operable independently of saidswitch operating mechanism for controlling the operation of said lockingmeans.

2. An electric switch gear including a stationary-frame having fixedline terminals, a truck having a switch mounted thereon, said switchhaving operating mechanism and also having terminals adapted tocooperate with the terminals of said frame, means for moving said trucktoward and away from said frame, means to lock said truck moving meansagainst operation, manual means operable independently of said switchoperating mechanism for controlling said locking means, and meansgoverned by the condition of the switch for controlling the operation ofsaid manual means.

3. In an electric switch gear, the combination of an enclosing cell, atruck having a switch mounted thereon and adapted to be movedhorizontally into and out of a circuit controlling position in saidcell, cooperating switch and line terminals carried by said truck andcell, force-multiplying means carried by the truck and cell arranged toeffect the movement of said truck into and out of circuit congoverned bythe condition of the switch for preventing operation of said manualmeans to release said truck except when the switch is in'open position.v

4. An electric switch gear including a stationary frame, a truckmovablehorizontally toward and away from said frame, cooperatingisolation contacts carried by said truck and frame, mechanism includinginterconnecting members carriedby the frame and truck for moving saidtruck a predetermined distance toward and away from said frame to effectengagement and disengagement of said isolation contacts, and lockingmeans engageable with one of said interconnecting members in any one ofa pluralityof different parts thereof for securing said trucl in aplurality of vhorizontally spaced positions relative to said frame.

5. An electric switch gear including a stationary frame, a truclrmovable horizontally toward and a vay from said frame, a switch mountedon said truck having switch operating mechanism, cooperating isolationcontacts carried by said truck and frame, forcemultiplying mechanismincluding interconnecting members carried by said frame and truck formoving said truck toward and away from said frame to eiiect engagementand disengagement of said contacts, manuallycontrolled means engageablewith one of said members in any one of a plurality of parts thereof forl cking said truck moving mechanism with the truck in a pluralityof'hori- Zontally spaced positions, and means engageable with a movablepart of said switch operating mechanism for governing the unlockingoperation of said locking means.

G. AnV electric switch gear including a stationary frame, a truckmovable horizontally toward and away from said frame, a switch mountedon said truck having switch operating mechanism, cooperating isolationcontacts carried by said truck and frame, mechanism includinginterconnecting members carried by said frame and truck for moving saidtruck toward' and away from said frame to effect eng .gement anddisengagement of said contacts, means engageable with one of saidmembers in a plurality of different parts thereof to lock said truck ineither of two horizontally spaced positions, manual means forcontrolling the operation of said locking means, and means interlockingsaid manual control means with said switch operating mechanism arrangedto lock said manual control moans against release of said truck eXceptin the switch open position of said switch operating mechanism and alsoto lock said switch operating mechanism A lie i nism including`interconnecting membersv carried bysaid frame and truck for moving saidtruclt toward and away from said frame to effect engagementdisengagement'of,

said contacts, means to lock said truclr in either of two horizontalpositions, manual means for controlling the operation of said lockingmeans, means interlocking said manual control means with saidswitchopcrating mechanism arranged to lock said manual control mea-nsagainst release of the truck in the switch closedV position of saidswitch operating mechanism and also to lock said switch operatingmechanism against movement to switch closed position when said manualcontrol means is in a truck unlocked position, and means to prevent theoperation of said manual control means to unlock said switch operatingmechanism during the movement of the truck between the aforesaidhorizontal positions. Y

8. An electric switch gear including a cell having line terminalstherein, a cooperating truck movable horizontally into and out of acircuit controlling position in said cell, Va switch mounted on saidtruck having switch terminals adapted to engage said line terminalsduring the respective final and initial movements of said truck into andout of circuit controlling position in said cell, raclring mechanismincluding interconnecting y3 members carried by said cell and truckarranged to effect the aforesaid final and initial movements of thetruck, means engageable with one of said members to lock said truckagainst movement, manual means operable from the front of the truck forconnecting said members, said manual means also constituting means forreleasing said truck locking means, and means governed by the open andclosed condition of the switch for locking said manual means againstoperation.

9. An electric switch gear including a cell having line terminals, ahorizontally movable truck having cooperating switch terminals, aforwardly extended rack `carried by the cell, a rack receiving housingcarried by the truck having a pinion arranged to cooperate with saidracl: to effect movement of said truck into and out of terminal engagingposition inlsaid cell, means operable from the front of the cell foreffecting the engagew ment of said rack and pinion, said means alsoconstituting locking means for securing said truck in a plurality ofhorizontal positions in the cell, and mechanism operable from the frontof saidicell for actuating said pinion.

l0. An electric switch gear including an enclosing cell, truck movablehorizontally into and out of a circuit controlling posin tionin saidcell, cooperating isolation con-- tacts carried by said cell and truck,a rack carried by a rear wall of saidV cell and ei;- tended forwardlyinto said cell, a housing carried by said truck adapted to receive theextended end of said rack, a pinion gea-r carried by said truck inposition to be engaged by said rack, said rack being normally biasedinto a lowered position free from said pinion, means carried by saidrack to engage and arrest the movement of the truck into the cell in thelowered position thereof, means to raise said rack out of said positionand into engagement with said pinion gear, a latch carried by saidtruck, abutments carried by said rack, and manual means to ino-ve saidlatch into locking engagement with said abutmentswhereby to arrest themovement of the truck.

ll. in electric switch gear including a stationary frame, a truckmovable toward and away from said frame, a circuit interrupter mountedon said truck, cooperating isolation contacts carried by said frameandinterrupter, operating mechanism for said interrupter,interconnecting members carried by said frame and truck for effectinghorizontal movement of said truck into contact engaging position, meansengageable with one of said interconnecting members for locking saidtruck in a plurality of horizontal positions, and means engageable witha movable part of said interrupter operatinO` mechanism and governed bythe Vopen and closed condition of the interrupter for controlling theoperation of said manual loclring means.

lf2. An electric switch gear including a stationary frame, a truckhaving a circuit interrupter mounted thereon, Acooperating isolationcontacts carried by said frame and truck, force-multiplying meansincluding coacting members carried by the cell and frame for movingsaidtruck away from said frame to separate said contacts, meansengageable with one of said members in a plurality of different partsthereof to lockA said truck against such movement, manual meanscontrolling the unlocking of said locking means, and means governed bythe condition of the interrupter arranged to lock said manual meansagainst release of said locking means when said interrupter is in closedcondition. Y

13. An electric switch gear including a stationary frame, a truck,cooperating isolation contacts carried by said frame and truck, acircuit interrupter carried by said truck, force-multiplying meansincluding cooperating racking members carried by said frame and truckarranged to move said truck toward said frame to effect engagement ofsaid isolation contacts, rocking means movable into engagement with oneof said members to prevent such movement, manual means for controllingthe -movement of said locking means, and means governed by the conditionof said interrupter preventing the movement of said locking means tounlocked position unless said interrupter is in open condition.

lll. The combination with anv electric switch gear having relativelyfixed and movable portions of circuit terminals carried by said fixedportion, a circuit interrupter carried by said movable portion havingininterrupter terminals adapted to cooperate with said fixed terminals,cooperating racking members carried by said fixed and movable portionsfor effecting the horizontal movement of said interruptor into and outof terminal engaging position, means to lock said interrupter ina'plurality` of definite horizontally spaced positions during itshorizontal movement, and interlocking mechanism associated with saidinterruptor arranged to prevent the operation of said lockingmeansexcept when the interrupter is fully open, and means associated withsaid racking means arranged to prevent the operation of said lockingmeans to lock said interruptor except in the aforesaid horizontalpositions of said interrupter.

15. The combination with an electric switch gear having fixed andmovable portions of circuit terminals carried by said fixed portion, acircuit interrupter carried by said movable portion having interruptorterminals adapted to cooperate with said fixed terminals, arack carriedby said fixed portion, a pinion gear carried by said movable portion,said rack and pinion adapted to be normally out of engagement, means tolock said truck in a plurality of horizontal positions, manual meanscontrolling the operation of said locking means, means also operated bysaid manual means to move said rack into position to engage said piniongear, said latter means arranged to hold said rack in pinion-engagingposition irrespective of asubsequent movement of said manual lockingmeans into .and out of switch locking position.

16. The combination with an electric switch gear having fixed andmovable portions of circuit terminals carried by said fixed portion, acircuit interrupter carried by said movable portion having interrupterterminals adapted to coopera-te with said fixed terminals, cooperatingrack and pinion members carried by said fixed and movable portions bywhich said interruptor is adapted to be moved into and out of terminalengag-ing position, cooperating means carried by said fixed and movableportions for arresting the horizontal movements of said interrupter in aplurality of positions, manual means controlling the operation of saidlocking means, and means controlled bysaid nals, a'truck type switchhaving switch terminals, means to move said switch into and n out of aposition in which said switch and circuit terminals are in engagement,means to lock said switch in either of two horizontal positions withrespect to said fixed terminals, manual means for controlling saidlocking means, and means governed by the closed and open condition ofsaid switch arranged to prevent the operation of said locking meansexcept in the fully open position of the switch, and means associatedwith said locking means arranged to prevent the operation of saidlocking means to unlock said interrupter except in the aforesaidhorizontal positions of said switch.

18. The combination of an enclosing cell having fixed circuitterminals,a truck type circuit interrupter having interrupter terminals `adaptedto cooperate' with said fixed terminals, cooperating rack and pinionmembers carried by said cell and truck, said rack adapted normally tooccupy a lowered position in which it is free from said pinion gear,cooperating abutments carried byrsaid truck and rack arranged in thelowered position of the latter to prevent the manual movement of saidtruck into the cell, rack-elevating means carried by said truck, lockingVmeans arranged to arrest the horizontal movement of said truck in aplurality of positions, manually controlled means for said locking meansalso constituting means to operate said rack-raising means 'foreffecting the engagement thereof with said pinion gear, and means tomaintain said rack and pinion in cooperating engagement duringsubsequent locking and unlocking of the truck.

19. The combination of an enclosing cell andv fixed circuit terminals,aV truck type switch having switch terminals adapted to cooperate withsaid fixed terminals, forcemultiplying means including cooperatingracking means carried by said truck and cell arranged to moveV saidtruck a rpredetermined distance toward and away from itsterminalengaging position, means to lock said truck a predetermineddistance away from its terminal engaging position, manual meanscontrolling thelocking and unlocking of said locking means, andcooperating means carried by said truck and cell arranged to effect theautomatic operation of said locking means to lockfsaid truck againstmovement in either direction vin Iresponse to the movements of salildtruck both into and out of its enclosing ce p 20. Electric switch gearincluding the combination of a cell having horizontal line terminalstherein, a truck type switch movable horizontally into and out of saidcell and having horizontal terminals which engage and disengage withsaid line terminals, means including an intermeshing rack and gearcarried respectively by said cell and switch for moving said switch intoand out of engagement with said line terminals, and means for effectingthe disengagement and re-engagement of said rack and gear forinterrupting the outward movement of said switch in a predeterminedpartially-withdrawn position thereof. Y

21. Electric switch gear including the combination of a cell havinghorizontal line terminals therein, a truck type switch movablehorizontally into and out of said cell and having horizontal terminalswhichengage and disengage said line terminals, means including anintermeshing pinion and rack carried respectively by said switch and'cell-for moving said switch into and out of engagement with said lineterminals, and means for moving said rack toward and away from said gearto effect the engagement and disengagement of said rack and gear.

22. Electric switch gear including the combination of a cell havinghorizontal line terminals therein, a truck type switch movablehorizontally into and out of said cell and having horizontal terminalswhich engage and disengage said line terminals, means including anintermeshing pinion and rack carried respectively by said switch andcell for moving said switch into and out of engagement with said lineIterminals, said switch having operating mechanism for opening andclosing it, means for moving said rack into and out of engaging positionwith said gear, and means controlled by the condition of said operatingmechanism for governing the operation of said rack-moving means.

23. Electric switch gear including thecombination of a cell havinghorizontal line terminals therein, a truck-type switch movablehorizontally into and out of said cell and having horizontal terminalswhich engage and disengage said line terminals, means including anintermeshing pinion and rack carried respectively by said switch andcell for moving said switch into and out of engagement with said lineterminals, and switch locking mechanism releasably engageable with saidrack Jfor locking the switch within said cell. l

24. Electric switch gear including the combination of a cell havinghorizontal line terminals therein, a truck-type switch movablehorizontally into and out of said cell and having horizontal terminalswhich engage and disengage said line terminals, means including anintermeshing pinion and rack carried respectively by said switch andcell for moving said switch into and out of engagement with said lineterminals, and switch locking mechanism releasably engageable in aplurality of positions with said rack for locking the switch in aplurality ofpositions in said cell.

25. Electric switch gear including the combination of a cell havinghorizontal line terminals therein, a truck-type switch movablehorizontally into and out of said cell and having horizontal terminalswhich engage and disengage said line terminals, means including anintermeshing pinion and rack carried respectively by said switch andcell for moving said switch into and out of engagement with said lineterminals, and switch locking mechanism releasably engageable in apkllurality of positions with said rack for loc 'ng the switch in aplurality of positions in said cell, and means governed by the conditionof the switch for governing the operation of said locking mechanism.

26. Electric switch gear including the combination of a cell havinghorizontal line terminals therein, a truck-type switch movablehorizontally into and out of said cell and having horizontal terminalswhich engage and disengage said line terminals, means including anintermeshing pinion and rack carried respectively by said switch andcell for ,moving said switch into and out of engagement with said lineterminals, said rack being vertically movable and being normally in alow position and adapted to engage a part of said switch as it is movedinto said cell to limit furtherV movement thereof, and means to raisesaid rack from engagement with such part and into mesh with said gearfor permitting thel rotation of said gear to move the switch furtherinto said cell.

27. Electric switch gear including the combination of a cell havinghorizontal line terminals therein, a truck-type switch movablehorizontally into and outof said cell and having horizontal terminalswhich engage and disengage said line terminals, means including anintermeshing pinion and rack carried respectively by said switch andcell for moving said switch into and out of engagement with said lineterminals, said rack being vertically movable and being normally in alow position and adapted to engage a part of said switch as it is movedinto said cell to limit further movement thereof, means to raise saidrack from engagement with such part and into mesh with said gear forpermitting the rotation oi said gear to move the switch further intosaid cell, and means controlled by the condition of the switch forgoverning the raising of said rack.

In testimony whereof, I have signed my name to this specification.

FREDERICK H. MACNEIL.

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